Motor vehicle exhaust imaging remote sensing monitoring device and method based on molecular optical rotation filter

Abstract

The invention discloses an imaging remote sensing monitoring device adopting molecular optical rotation and filtration for motor vehicle exhaust gases. The imaging remote sensing monitoring device comprises a motor vehicle information acquisition unit, an imaging remote sensing monitoring unit and a signal processing unit, wherein the imaging remote sensing monitoring unit comprises an imaging lens; light through the imaging lens sequentially passes through a first polarizing prism, a molecular bubble, a second polarizing prism and an optical filter and then is imaged by an imaging detector; amagnet is arranged on the outer side of the molecular bubble; the imaging detector and the motor vehicle information acquisition unit are respectively connected with the signal processing unit; the polarization direction of the first polarizing prism is orthogonal with that of the second polarizing prism; the molecular bubble is filled with filling gases. The invention also discloses an imaging remote sensing monitoring method adopting the molecular optical rotation and filtration for the motor vehicle exhaust gases. The imaging remote sensing monitoring device and the imaging remote sensingmonitoring method disclosed by the invention have the advantages of high accuracy, small data scatter degree, high anti-interference suppression ability, high adaptive capacity to environment, high monitoring sensitivity, good result visibility and the like.

Description

technical field [0001] The invention relates to motor vehicle exhaust monitoring, in particular to a motor vehicle exhaust imaging remote sensing monitoring device with molecular optical rotation filtering, and also relates to a motor vehicle exhaust imaging remote sensing monitoring method with molecular optical rotation filtering. Background technique [0002] With the development of transportation technology and demand, the proportion of motor vehicle exhaust emissions to air pollution is increasing day by day. Real-time and working condition detection brings great difficulty and is a technical bottleneck in the construction of the supervision system. [0003] A lot of technical explorations have been carried out at home and abroad. At present, the detection of vehicle exhaust emissions in various places generally adopts the simple working condition sampling detection method, that is, the exhaust emissions of motor vehicles are sampled under the designated detection place...

AI Technical Summary

Problems solved by technology

However, due to the uncertainty of the number of chimneys and the spatial position of the motor vehicle during driving, and the shape of the emitted smoke plume is also variable and extremely uneven, the diameter of the laser beam used for monitoring and the aperture of the receiving and monitoring telescope cannot be ignored in the project. The expansion of the restriction causes only the tail gas in the volume of the plume that the laser beam passes through to be monitored, and even the laser beam does not pass through the plume accurately, so the monitoring result is: if the laser beam passes through the plume, the concentration If the laser beam passes through the thinner part of the plume, the monitored exhaust emission is very small; if the laser beam does not pass through the plume accurately, the exhaust emission cannot be monitored.

In this way, even for the same motor vehicle, under the same driving conditions and environmental conditions, the monitoring results are very different, resulting in a very large dispersion of monitoring data. Accurate tail gas pollution emission value

[0005] In 2009, a new method of detecting NO trace gas concentration using quantum cascade laser and NO optical rotation effect was proposed, which effectively improved the detection sensitivity of NO (Document 3: Ultrasensitive detection of nitric oxide at5.33μm by using external cavity quantum cascade laser -based Faradayspectroscopy, PNAS, 2009vol.106no.31pp12587–12592; Literature 4: Continuous monitoring of nitric oxife at 5.33μm with an EC-QCL based Faraday rotation apectrometer: laboratory and field system performance, Proc. of SPIE Vol.7222M-72 1~8, 2009), this method is for sampling and detection of NO gas, which is not suitable for remote sensing monitoring

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